Diagenesis of the Cretaceous glutenite and its control on the reservoir porosity in the Fangzheng depression, Northeast
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ORIGINAL ARTICLE
Diagenesis of the Cretaceous glutenite and its control on the reservoir porosity in the Fangzheng depression, Northeast China You‑Zhi Wang1 · Cui Mao2 Received: 9 March 2020 / Accepted: 14 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The reservoir of glutenite has obvious anisotropy characteristics, so diagenesis has a significant impact on its physical property of the reservoir. In view of unclear control factors for densification of the Cretaceous glutenite reservoir in the Fangzheng depression, the diagenesis type of glutenite reservoir and its impact on the physical property of reservoir in the research area were studied by core analysis, electronic probe analysis, scanning electron microscope (SEM) analysis, X-ray energy spectrum analysis, and X-ray diffraction (XRD) analysis. The results showed that there are four types of diagenesis, compaction, dissolution, cementation, and metasomatism. The glutenite reservoir experienced a relatively strong mechanical compaction, which seriously damaged the original pores of the reservoir, with a decrease of 15.97%. This is the most important cause of the densification of the Cretaceous glutenite reservoir. Due to the injection of other hydrocarbon fluids, a large amount of organic acid entered the reservoir through residual pores and fractures, which promoted the dissolution of minerals such as potassium feldspar, formed secondary pore zone, improved the glutenite reservoir performance, and increased the porosity by 6.79%. The primary and secondary pores are filled by cementation with a porosity reduction of 6.53%, which is another key factor for reservoir densification. Through the analysis of the physical property of glutenite reservoir, it is believed that the high-quality Cretaceous reservoir in the Fangzheng depression is mainly developed in the subaqueous distributary channel in frontal fan delta near the oil-source fault. The frontal fan has a high primary porosity and is the material basis for the formation of the reservoir. Keywords Glutenite · Reservoir space · Diagenesis · Porosity evolution · The Fangzheng depression
Introduction The term glutenite refers to sandstone with a gravel content greater than 15% and less than 30%. With the development of theory and technology, breakthroughs have been made in oil–gas exploration in the tight reservoir (Xiang et al. 2016; Jian et al. 2017). The discovery of glutenite reservoir in Mahu oilfield made the glutenite in the depression area become a potential substitute field for future oil–gas exploration (Dewen and Abulimit 2014; Lichun et al. 2014). It is well known that glutenite can be used as a high-quality reservoir and is closely related to diagenesis (Yongshi et al. * Cui Mao [email protected] 1
Exploration and Development Research Institute of Daqing Oilfield Company Ltd., Daqing 163712, China
School of Geosciences, Northeast Petroleum University, Daqing 163318, China
2
2016; Fenggui et al. 2010; Yong et al. 2008). For example, the dissolutio
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